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Magnetite ore powder mixed with 18 mass% of graphite, coke or coal was heated by microwave with 2.45GHz under nitrogen gas. The mixed powder was heated up to 1360°C during 10 min and pig iron with 3 to 4 mass% of carbon was produced. During the reduction of iron oxide, CO and CO2 gases generated. Their concentrations were analyzed using a gas chromatography and the weight loss of the mixture was measured using a thermal balance. The reduction proceeded in 2 steps of first 100s and after. In the first step, the temperature rapidly increased up to about 800°C and then decreased to about 600°C. CO2 gas was produced more than CO gas. After 100s, the temperature gradually increased and CO gas was predominantly produced. In the first step, magnetite absorbed magnetic field energy of microwave to generate heat and was reduced to wustite (FeO). In second step, graphite in the mixture absorbed the electric field energy of microwave to generate heat. Many hot spots appeared in the mixture to generate heat during heating. Then the temperature of sample was apparently low.
Magnetite ore powder mixed with 18 mass% of graphite, coke or coal was heated by microwave with 2.45GHz under nitrogen gas. The mixed powder was heated up to 1360°C during 10 min and pig iron with 3 to 4 mass% of carbon was produced. During the reduction of iron oxide, CO and CO2 gases generated. Their concentrations were analyzed using a gas chromatography and the weight loss of the mixture was measured using a thermal balance. The reduction proceeded in 2 steps of first 100s and after. In the first step, the temperature rapidly increased up to about 800°C and then decreased to about 600°C. CO2 gas was produced more than CO gas. After 100s, the temperature gradually increased and CO gas was predominantly produced. In the first step, magnetite absorbed magnetic field energy of microwave to generate heat and was reduced to wustite (FeO). In second step, graphite in the mixture absorbed the electric field energy of microwave to generate heat. Many hot spots appeared in the mixture to generate heat during heating. Then the temperature of sample was apparently low.
Palavras-chave
magnetite, graphite, Pig iron, Microwave, gas chromatography, environments
magnetite, graphite, Pig iron, Microwave, gas chromatography, environments
Como citar
NAGATA, Kazuhiro;
Hayashi, Miyuki.
Pig iron making by microwave heating
,
p. 134-142.
In: 7th Japan-Brazil Syposium on Dust Processing-Energy-Environment and 1st International Seminar On Self-Reducing and Cold Bonded Agglomeration,
São Paulo,
2008.
ISSN: -
, DOI 10.5151/5463-5463-0016
